Re: how to connect 2 nodes to a SCSI disk (cabinet)

[Eddie Williams <Eddie.Williams@steeleye.com>]

I take it this "someone initialized ..." message is coming from the BIOS?  I 
don't see anything like this in the SCSI driver source directory.

I have used both the aic7xxx new and old doing clustering so with those 
drivers and the cards they support I know it works.  If you are not using the 
aic7xxx driver then it may be that the driver is not honoring the initiator 
ID set in BIOS and so you have a conflict.

I don't see below where you say what specific adapter you are using?  

Eddie
On Friday 20 June 2003 03:32 pm, Ranade, Prakash wrote:
> both hang at boot time...they both try to initialize the device and
> hang..... if i boot node1 without starting node2 then node1 boots up but
> then when i try to boot node2 then it keeps saying "someone initialized
> channel A"....
>
> Prakash S. Ranade
> OCP - Oracle Certified DBA 8i, 9i
> 205 776 2320
>
> "Lets document it and call it a feature"
>
>
> -----Original Message-----
> From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> Sent: Friday, June 20, 2003 2:24 PM
> To: Ranade, Prakash
> Cc: linux-scsi@vger.kernel.org
> Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
>
>
>
> Please define "there is a conflict when they try to initialize the bus."
>
> Do you have a SCSI analyzer seeing some conflict?
> When you boot them both up, one or both hang?
> One or the other can not read the fdisk when they boot?
>
>
> Eddie
>
> On Friday 20 June 2003 02:55 pm, Ranade, Prakash wrote:
> > yes they can see the drive but there is a conflict when they try to
> > initialize the bus...
> >
> > Prakash S. Ranade
> > OCP - Oracle Certified DBA 8i, 9i
> > 205 776 2320
> >
> > "Lets document it and call it a feature"
> >
> >
> > -----Original Message-----
> > From: Eddie Williams [mailto:Eddie.Williams@steeleye.com]
> > Sent: Friday, June 20, 2003 1:26 PM
> > To: jansen, frank; Ranade, Prakash; Mike Dresser
> > Cc: linux-scsi@vger.kernel.org
> > Subject: Re: how to connect 2 nodes to a SCSI disk (cabinet)
> >
> >
> >
> > Depending on which adaptec card you are using you may need to set a
> > jumper to force termination.  Some of the older Adaptec cards have "soft"
> > termination. Meaning, when power is applied it will drive termination but
> > when power is dropped termination is dropped.  For those cards setting a
> > jumper will force termination even when the power is removed.  This is
> > pretty important if you power off one server.
> >
> > It is probably safe to assume other wise but just to be sure, this is not
> > a dual ported SCSI drive is it?  If so then it is not really a shared bus
> > and in that case the drive would need to terminate both busses.
> >
> > I agree with Frank here, you want the hosts at 7 and 6.
> >
> > If you power the servers up one at a time can they see the drive OK? 
> > Start simple.
> >
> > Eddie
> >
> > On Friday 20 June 2003 01:49 pm, jansen, frank wrote:
> > > This is fairly old technology, so I'll have to go back in my memory
> > > banks, but here are my recollections on setting this up:
> > >
> > > - Change the topology so that there is no termination on either HBA and
> > > use Y-cables with external termination, so that you can unplug either
> > > host from the bus without taking down access for the other host.  The
> > > topology will look as follows:
> > >
> > >     T   _______external SCSI driver______________   T
> > >      \ /                                         \ /
> > >       Y                                           Y
> > >    node 1 							node 2
> > >
> > > The other option is to leave termination on both HBAs, inwhich case you
> > > should never unplug anything.  Note that the bus must be arbitrated on
> > > both ends.  Also be sure not to violate any length limits on your SCSI
> > > bus. - ID settings: set one HBA to 7 and the other to 6.  The reason
> > > for these numbers is that the arbitration scheme for SCSI runs 7 down
> > > to 0 to 15 down to 8.  In your current configuration the disk has a
> > > higher arbitration priority than the HBAs.
> > > - Disable bus erset on power up on both HBAs; this will ensure that you
> > > can power either host without clearing all outstanding requests on the
> > > bus.
> > >
> > > If none of your pins are bent anywhere, this should work for sharing a
> > > device.  Now you'll get to the fun part of 2 hosts coordinating access
> > > to a single device.
> > >
> > > Good luck,
> > >
> > > Frank
> > >
> > > -----Original Message-----
> > > From: Ranade, Prakash [mailto:prakashr@intgroup.com]
> > > Sent: Friday, June 20, 2003 1:01 PM
> > > To: Mike Dresser
> > > Cc: linux-scsi@vger.kernel.org
> > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > >
> > >
> > > isent it true that...
> > > you cannot have two seperate SCSI controllers trying to maintain the
> > > same bus.They will fight..for same bus?
> > >
> > > Prakash S. Ranade
> > > OCP - Oracle Certified DBA 8i, 9i
> > > 205 776 2320
> > >
> > > "Lets document it and call it a feature"
> > >
> > >
> > > -----Original Message-----
> > > From: Mike Dresser [mailto:mdresser_l@windsormachine.com]
> > > Sent: Friday, June 20, 2003 11:57 AM
> > > To: Ranade, Prakash
> > > Cc: linux-scsi@vger.kernel.org
> > > Subject: RE: how to connect 2 nodes to a SCSI disk (cabinet)
> > >
> > > On Fri, 20 Jun 2003, Ranade, Prakash wrote:
> > > > node1 and node2 both running redhat linux 7.2...both have Adaptec
> > > > scsi
> > >
> > > card in it...scsi disk is  DataSilo DS-100 (see attached manual) using
> > > Seagate HD.
> > >
> > > > node1:scsi id = 14 - scsi termination is disabled
> > > > node1:scsi id = 15 - scsi termination is automatic (i tried all
> > >
> > > enabled/disabled/automatic nothing works)
> > >
> > > > external scsi disk id = 0
> > > >
> > > > node 1 							node 2
> > > >
> > > >
> > > > 	---------external SCSI drive---------------
> > >
> > > Any internal connections on either SCSI card?
> > >
> > > If not, set both node's to enabled scsi termination.
> > >
> > > Mike
> > >
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > in the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-scsi"
> > > in the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html